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-f/4+7=-45
We move all terms to the left:
-f/4+7-(-45)=0
We add all the numbers together, and all the variables
-f/4+52=0
We multiply all the terms by the denominator
-f+52*4=0
We add all the numbers together, and all the variables
-1f+208=0
We move all terms containing f to the left, all other terms to the right
-f=-208
f=-208/-1
f=+208
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